1)
" ? ki Shiv'as Yamim Yemalei es Yedchem". What is the significance of the seven days
2.
R. Bachye #2 (in Pasuk 36): Because they encompassed 'the entire Building' - See answer #1. Therefore Moshe served all seven days and dressed Aharon the seven garments - Refer to 8:7:4:3 - in order to bring down the Shechinah which comprises seven, and on the following - the eight - day, on the first of Nisan, the Shechinah rested.
1
R. Bachye: Which explains why the seven days are called 'Yemei Milu'im' - 'days of completion'.
